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Re:GitHub Supports Web Authentication (WebAuthn) for Securit... by ericseppanen on Wednesday August 21, 2019 @09:18PM (#20763743)
A Solo key is $20.

https://solokeys.com/

Re:GitHub Supports Web Authentication (WebAuthn) for Securit... by CameronNemo on Wednesday August 21, 2019 @10:34PM (#20764116)
Note that the feature set on this is limited. Specifically it is missing GPG (and thus SSH) support. It may be added via a software update if the somu campaign goes very well. But frankly that is a long shot.

https://www.crowdsupply.com/solokeys/somu

Of course if you only need WebAuthn then solo keys are a great option.